Telephone-receiver



E. HAUSDORF.

TELEPHONE RECEIVER.

APPLICATION FILED NOV. 7. I919;

1,359,061 Patented Nov. 16, 1920 firm/Woe.-

44% JWewfi WMMU 4W UNITED STATES ERICH HAUSDOIRF, 0F BERLIN, GERMANY.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented Nov. 16, 1920.

Application filed November 7, 1919. Serial No. 336,527.

T 0 all-whom it may concern:

Be it known that I, Enron HAUsDoRr, a citizen of the German Reich, residing at Berlin, Germany, have invented ned and useful Improvements in Telephone-Receivers, of which the following is a specification.

This invention relates to a new type of telephone receiver which may be put ont( the ear and prevents all noises from without from penetrating to the same. Hence the new receiver is suitable for use in noisy places and is especially adapted for the reception of military commands. A demand has long existed for an army receiver which completely cuts oil? the auditory duct from communication without While leaving the hands disengaged and allowing the user of the instrument to move with perfect freedom.

Contrivances for deaf persons are known consisting of a hearing tube with an elongated part that enters the auricle, and telephone receivers are known having an outer portion which embraces the shell of the ear and clings fast to it.

By the present invention a device is produced in which these two features are combined. the device consisting of a telephone receiver having one member which incloses the electrical portion and the diaphragm of the instrument, and which also enters. the auricle or shell of the ear, and a second member which embraces or surrounds the receiver and the shell of the ear, thus enabling the receiver to perch upon the ear. By this combination the auditory duct is subjected solelyto the action of the electromagnetic members of the receiver and is completely shut ofl from external noises;

the receiver clings to the car even if severely shaken, the inner part of the receiver which enters into the auricle, and the outer portion, which embraces the ear, cooperating so as to effectually bring about this result. Hence the person using the receiver has both his hands free.

A manner of carrying out the invention is illustrated in the drawing in which Figure 1 is a-front elevation Fig. 2 a rear view and Fig. 3 a section of the receiver on the line 1-1 of Fig. 2.

The inner part of the receiver comprises the casing h, the coil g and the diaphragm f and abuts at one side against acover at which has an opening m. The cover 1% is furnished with a flange-shaped extension 72 by which the cover n is attached to the mo ternal finishing piece. The finishing piece consists of the parts a and a, the part 41 having an opening Z). The cover n, the extension n and the part a inclose a space 6.

The internal and external parts of the receiver are held together by screws 1) and 9. Th; electrical connections are contained 1n 0.

()n the receiver being placed on the ear the inner cover of the receiver enters the auricle or shell of the ear and the shell is embraced by the parts a, e.

I claim:

In a telephone receiver, an electrical memher, a diaphragm, a primary covering-member adapted to inclose the electrical member and the diaphragm and to enter the shell of the ear, and a'secondary covering member adapted to embrace the receiver and the ear round-about so as to cling to the latter and to more effectively convey the sound into the air and exclude extraneous sounds from the ear. i

In testimony whereof I have signed my name to this specification.

ERICH HAUSDORF. 

